How to recreate the spaghettification process around blackhole in blender?
This sounds like a job for the lattice-modifier!
Outside of the funnel-shaped lattice, the sphere is undeformed...

...then it gets sucked in...

...and spaghettifies!

Make the lattice a bit more detailed and curved, and you should get what you need.
The accretion disk and jets can be made with particle systems. As for the gravity-lensing, there are quite a lot of tutorials out there that deal with making &quot;Interstellar&quot;-like black holes